IOS8 differently: Autolayout with view.transform = CGAffineTransformMakeScale (0.5, 0.5), the view is not set correctly

Question

I use a machine

I want to make a smaller UISwitch and then use view.transform = CGAffineTransformMakeScale(0.5, 0.5) to implement it.

There is another view above this switch. This master switch must be aligned with this leading edge of the view, and there is a fixed vertical space between the view and the switch, for example, the following image:

IOS7 Views

However, on iOS8 there is a different look:

IOS8 Views

It appears that the restrictions do not apply to this switch.

But I called self.view.layoutSubviews() and self.view.layoutIfNeeded()

This does not work.

How to enable this switch in the lower right corner of the above view?

Here the switch does not scale

Answer 1

You have two possible ways to go here: either a subclass of UISwitch, or try to apply all the necessary changes to the subclass or define a new UIView that includes a modified UISwitch as a subview. A subclass may be the fastest, but it is more complicated and risky, since UISwitch was not intended for subclasses for such modifications.

Suppose you send a subclass route, here is what you need to do:

• apply the scaling transform to self , obviously.

• override alignmentRectForFrame: so it returns super.alignmentRectForFrame: plus your scaling transform.

• override intrinsicContentSize , so it returns super.intrinsicContentSize plus your scaling transform

Basically, number 1 should do the actual visual conversion. But 2 and 3 are necessary in order to inform Auto Layout about the size of the new view, since by default AL is not aware of the transformations.

Answer 2

The view transforms around the view center, so when you call

 view.transform = CGAffineTransformMakeScale(0.5, 0.5) 

It makes sense that this is similar to iOS 8, the reason it looks good in iOS 7 is probably due to a bug in iOS 7.

Try changing the leading constraint constant as follows:

 self.switchLeadingConstraint.constant = -(self.mySwitch.bounds.size.width/4) 

Thus, you can compensate in the offside that you have in iOS 8.